Multiple mode oxygen delivery system
First Claim
1. A gas delivery apparatus consisting essentially ofa gas pressure regulator, having an input and an output, with said input selectively coupled to a gas supply source;
- a pressure sensor coupled to said output of said gas pressure regulator for sensing fluidic supply pressure emitted from said output of said pressure regulator;
at least one gas valve, having an input and an output, with said input of said at least one gas valve fluidically coupled to said output of said pressure regulator downstream of said pressure sensor;
a control system for controlling said at least one gas valve and communicating with said pressure sensor; and
an output port coupled to said output of said at least one gas valve.
2 Assignments
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Accused Products
Abstract
In various embodiments of a pulse dose and conservation oxygen delivery system, a control circuit, which is typically microprocessor based, monitors a differential pressure sensor coupled to a patient interface such as a cannula or a face mask. When a patient inhales, a negative pressure is detected at the patient interface point. This condition is sensed and an electrical signal corresponding to the condition is sent to the control circuit. The control circuit processes the signal and then energizes a valve, through driver circuitry, that connects the patient to the oxygen supply for a fixed period of time at a preselected amount. The control circuit continually monitors the pressure differentials at the patient interface and only delivers pulses of oxygen upon the inhalation of the patient. Oxygen delivery is based on a fixed volume of oxygen per breath which provides the advantage of a varying net volume being delivered to the patient per period of time depending on their respiratory rate. If a patient exercises and their breathing rate increases, the control circuit will automatically and proportional to the breathing rate, increase the net volume of oxygen being delivered. In addition if the control circuit fails to sense patient inhalation for a predetermined period of time, it will automatically force pulses of oxygen to the patient while signalling this emergency condition to others. If the control circuit malfunctions or the unit loses power it will fail in such a way that it will still supply a continuous flow of oxygen to the patient, providing an extra level of safety.
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Citations
34 Claims
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1. A gas delivery apparatus consisting essentially of
a gas pressure regulator, having an input and an output, with said input selectively coupled to a gas supply source; -
a pressure sensor coupled to said output of said gas pressure regulator for sensing fluidic supply pressure emitted from said output of said pressure regulator; at least one gas valve, having an input and an output, with said input of said at least one gas valve fluidically coupled to said output of said pressure regulator downstream of said pressure sensor; a control system for controlling said at least one gas valve and communicating with said pressure sensor; and an output port coupled to said output of said at least one gas valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of delivering a respiratory gas to a patient comprising the steps of:
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providing a portable gas delivery system comprising a gas pressure regulator having an input and an output, with the input selectively coupled to a gas supply source, a pressure sensor coupled to said output of the gas pressure regulator for sensing fluidic supply pressure emitted from the output of the pressure regulator, at least one gas supply valve having an input and output, with the input of the at least one gas valve fluidically coupled to the output of the pressure regulator downstream of the pressure sensor, a control system for controlling the at least one gas valve and communicating with the pressure sensor, and an output port coupled to the output of the at least one gas valve; supplying a gas at a controllable pressure and predetermined flow rate from said gas supply source to the at least one gas supply valve; monitoring the breathing cycle of a patient; measuring the volume of said supply gas through said at least one gas supply valve; and
controlling said at least one gas supply valve to supply a predetermined volume of gas to said patient at predetermined times according to said breathing cycle. - View Dependent Claims (18, 19, 20)
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21. A portable gas delivery apparatus comprising:
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a gas pressure regulator, having an input and an output, with said input selectively coupled to a gas supply source; a pressure sensor coupled to said output of said gas pressure regulator for sensing fluidic supply pressure emitted from said output of said pressure regulator; at least one gas valve, having an input and an output, with said input of said at least one gas valve fluidically coupled to said output of said pressure regulator downstream of said pressure sensor; a control system for controlling said at least one gas valve and communicating with said pressure sensor; and an output port coupled to said output of said at least on gas valve; wherein the gas delivery apparatus is portable with a user. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification